Paper-pulp strainer.



Patented Dec. l,l |90I.

N. L. VBUMAN R. H. KIRKLAND.

v lPAPER PULP STRAINER.

(Application md sape. 2e, 1901.) (H9 Model.) 3 Sheets-Sheet I.

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No. 689,934. Patented Dec. 3|, |90I. N. L. VRUOMAN -&. R. R. KIRKLAND.

PAPER PULP STBAINER.

(Applicationled'sept. 28, 1901.)

(Nn Model.) 3 Sheets-Sheet 2.

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No. www. y Patented Dec. 3|, |901. f

. N. L. vooMAN & R. n. KIRKLAND.

PAPER PULP STRAINER.

(Application med sept. 2a. 1901.)

(No Modal.) 3 Sheets-Sheet 3.

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nrnur NATHANIEL L. VROOMAN AND ROBERT R. KIRKLAND, OF VVATERTOWN, NEW YORK.

PAPER=PULP STRAINER.

SFFJGIFCATION forming part of Letters Patent No. 689,934, dated December 31, 1901.

Application led SeptembcrZS, 1901. Serial No. 76.917. (No model.)

T0 all whom it may concern.-

Be it known that we, NATHANIEL L. VROO- MAN and ROBERT R. KIRKLAND, citizens of the United States, residing at Vatertown, in the county of Jefferson and State of New York, have invented a new and useful Paper-Pulp Strainer, of which the following is a specification.

.This invention relates to certain improvements in devices of that class employed for straining or screening wood-pulp and other iibrous material employed in the manufacture of paper, and has for its principal object to provide an improved form of screen which may be so adjusted as to form larger or smaller screening-spaces, the screen being formed of a large number of separate bars of any desired shape in cross-section and such bars being readily removed when it is desired to employ bars of larger or smaller size, to replace worn bars, or to substitute bars of different shape in cross-section for any particular class of work.

A further object of the invention is to provide a pulp-strainer of the highest eiciency and ot' simple and economical construction, as more fully described'hereinafter.

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation on the line l 1 of Fig. 2, illustrating a pulp-strainerconstructed in accordance with. our invention, the screen-bars being omitted for the sake of clearness. Fig. 2 is a transverse sectional elevation of the same on the line 2 2 of Fig. 1 and drawn on a somewhat larger scale. Fig. 3 is a plan view, on a still larger scale, of a portion of the screen-cylinder. Fig. 4 is a longitudinal sectional elevation through one edge o the cylinder, illustrating the construction and arrangement of the screen-bars and their supporting devices. Figs. 5 and 6 are views similar to Fig. 4, illustrating screen-bars of different shape in cross-section. Fig. 7 is a detail perspective view of a portion of one of the racks employed to support the screenbars. Figs. 8, 9, and 10 are detail perspective views of portions of the screen-bars illustrated in Figs. 4, 5, and 6, respectively.

Similar numerals of reference are employed to indicate corresponding parts throughout the various views of the drawings.

5 designates a suitable tank supported on standards 6 and adapted for the reception of the polygonal screen 7. Extending longitudinally of the tank and supported in suitable bearings at opposite ends is a shaft 8, on which the screen is supported. One end of the shaft passes through a stuffing-box 9 of the usual type, arranged at one end of the tank, and the opposite end of the shaft eX- tends through and operates a rotary pump 10, mounted on a suitable supporting-table 11, the extreme end of the shaft being provided with a belt-wheel 12, by which it may be operated from any suitable source of power. The screen is supported at points intermediate of its length by suitable spiders 13 and at one end is closed by a plate 14. The opposite end of the screen is closed by a plate 15, having a tubular extension 16, forming a trunnion which partially supports the Weight of the screen. The trunnion 16 projects into a water-stufiing box 17, having an annular groove 18, with which communicates a watersupply pipe 19, Water under sufficient pressure to overcome the pressure in the tank being forced through said pipe. The extreme end of the trunnion projects into a groove 20, formed at the end of the box 17, to form a joint as nearly liquid-proof as possible.

The pulp-stock is fed into thetank 5 through its open top until the straining-cylinder is entirely submerged. The cylinder is revolved by the shaft 8 and at the same time the pump 10 is actuated, tending to create a partial vacuum within the cylinder and drawing into said cylinder such of the fibrous contents of the tank as may be ne enough to pass through the screen. This screen material is delivered by the pump 10 to the paper-making machine or to a vat or reservoir at any suitable point in the mill.

At the bottom of the tank is arranged a valved outlet-pipe 22, through which any waste material maybe withdrawn when it is desired to clean the tank.

In the opposite end walls of the screen and in the intervening spider-rims are formed radially-disposed alining slots 23, adapted to receive the longitudinal screen-supportingv bars 24. The screen-supporting bars 24 are confined in position radially by straps 25 and IOO are further held by rings 26, arranged at the ends of the cylinder and held in position by suitable securing screws or bolts 27. Each bar is provided throughout its entire length with substantially V shaped teeth having slightly-attened tops, the pitch of the teeth being exactly the same on each bar and the teeth being formed as accurately as possible in order to provide for the even spacing of the screenbars which they support.

The screen-bars 29 are preferably formed of spring-brass and are of a length equal to Vzo the Width of one of the sides of the cylinder. The bars are entered in parallel relation in the teeth of the supporting-bars, and being of exactly the same shape and size in cross-section the screening-interspaces will all be exactly the same in width. The screen-bars are confined in place by clamping-bars 30,extend ing longitudinally of the cylinder at points in radial alinement with the su pportin g-bars 24, each bar 24 forming, in connection with a bar 30, a clamp in which the screen-bars are rigidly confined.

The screen-bars 29 are of a shape in crosssection most suitable to the Work required and may be of the form illustrated in Fig. 4, the form herein shown being substantially V -shaped with slightly-rounded tops.

In Fig. 5 is illustrated a number of screenbars of cylindrical form, and the bars shown in Fig. 6 are hexagonal in cross-section. The bars are all made of the same length and of the same diameter at the Widest points, so that they may be readily interchanged to suit dierent classes of Work. The bars may be of various sizes in cross-section other than that shown in order to provide for a larger or smaller screen opening or gage, and if a triiie worn the substitution of su pporting-bars having teeth of smaller pitch will restore the original gage. The screen-bars may be made of other forms in cross-section, either regular or irregular,to suit differentrequirements of use, and the shape of the teeth of the supportingbars may be altered to accommodate the bars of larger or smaller size or of different shape in cross-section Without departing from our invention.

The construction of screen bar and cylinder, as described, is such as to render it exceedingly desirable in devices of this class,

Where any change necessary for work of spe- -cial character would otherwise require the construction of an entirely new cylinder.

Various other changes and modifications in the form, proportions, size, and minor ,details of construction maybe made Within the scope of the claims without departing from the spirit or sacricin g any of the advantages of the invention.

Having thus described our invention, what we claim isl. In a paper-pulp strainer, a screening device comprising a polygonal cylinder having a series of longitudinal supporting-bars having serrated surfaces forming substantially V-shaped teeth with correspondingly-shaped intervening recesses, and removable screenbars adapted to such recesses.

2. In a paper-pulp strainer, a screening device comprising a polygonal cylinder having on each of its sides a series of bars provided with serrated surfaces forming substantially V-shaped teeth with correspondingly-shaped intervening recesses, removable screen-bars extending transversely of each of the cylinder sides and adapted to said recesses and means for securing said bars in position, substantially as speciiied.

3. In a device of the class specified, a polygonal cylinder having a series of toothed bars extendinglongitudinally thereof, and a series of screen-bars equal in length to the width of one of the sides ot the cylinder and carried by said toothed bars. y

4. In a device of the class specified, a cylinder having radially slotted end plates, toothed supporting-bars adapted to said slots, means for securing said bars in position, and removable screen-bars carried by said toothed bars.

5. In a device of the class specified, a cyla inder having radially-slotted end plates, a series of toothed bars adapted to said slots, a peripheral strap adapted to hold said bars in position, and an end ring secured to each of the plates and adapted to hold said bars against longitudinaldisplacement, a series of removable screen-bars carried by said toothed bars, and means for cn tinin g said screen-bars in position.

6. In a device of the class specified, a tank, a shaft extending longitudinally of the same, a rotatable screen carried by said shaft and IOC having end supporting-plates, a trunnion I formed on one of said plates, a water-box adapted for the reception of said trunnion, there being in said box an annular groove for thereception of Water under pressure.

IIC 

